Ultraviolet photoelectron spectroscopy of copper clusters
Ultraviolet photoelectron spectroscopy of copper clusters
复制标题
铜簇的紫外光电子能谱
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
R. Smalley
中科院分区：
文献类型：
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作者：
C. L. Pettiette;Shihe Yang;M. Craycraft;J. Conceição;R. Laaksonen;O. Cheshnovsky;R. Smalley
利用新型磁聚焦飞行时间光电子能谱仪，在4.66 eV的光子能量下测量了铜原子质量选择负团簇的紫外光电子能谱(UPS)。这些UPS数据首次提供了这种中等尺寸负铜团簇的4S价带结构的详细探测，并推广了以前对相应中性物种的电子亲和力的近似测量。计算结果与单价金属团簇的椭球壳模型的预测相一致。特别是，团簇8、20和40(在这个简单的模型中对应于球形壳层闭合)被发现具有异常低的电子亲和势和大的HOMO-LUMO能隙。在这份新的UPS数据中，14和34的次级壳收盘价也显得特别。
Using a new magnetically focused time‐of‐flight photoelectron spectrometer, the ultraviolet photoelectron spectra (UPS) of mass‐selected negative copper clusters have been measured at photon energy of 4.66 eV for all clusters in the range from 6 through 41 copper atoms. These UPS data provide the first detailed probe of the 4s valence band structure of such medium size negative copper clusters, and extend previous approximate measures of the electron affinity of the corresponding neutral species. The results are in accord with the predictions of the ellipsoidal shell model for monovalent metal clusters. In particular, clusters 8, 20, and 40 (which correspond to spherical shell closings in this simple model) are found to have unusually low electron affinities and large HOMO–LUMO gaps. Subshell closings at 14 and 34 also appear special in this new UPS data.